Library · IAA RAS

Papers

Increasing the Transmission Range of Frequency and Time Signals by VCH-608 Modems

A. V. Zheglov, R. S. Kobyakov, R. N. Novozhilov, S. Yu. Medvedev

Transactions of IAA RAS, issue 67, 35–43 (2023)

Keywords: transmission of precision frequency and time, compensation of phase instability, comparison of time scales

About the paper Full text

Abstract

The features of transmission of frequency and time signals are considered depending on the length and elemental composition of the FOCL, taking into account the total and return losses. The studies were carried out on the basis of two modifications of the VCH-608 and VCH-608.02 modems. In modifications of the VCH-608 modem, a circulator is used to organize duplex communication. Modems of this modification are connected via one fiber. To transmit 100 MHz and 1 PPS signals, two wavelengths of 1310 nm and 1550 nm must be used. However, there are no available optical amplifiers that operate simultaneously at these two wavelengths. In modifications of the VCH-608.02 modem, four fibers of a single cable module are used to organize duplex communication. This makes it possible to transmit 100 MHz and 1 PPS signals at the same wavelength, and also simplifies the use of optical amplifiers and chromatic dispersion compensators in fiber optic lines. Prototyping of options for transmitting frequency and time signals by pairs of conjugated modems and their cascades has been carried out. The limitations on the optical budget of FOCL associated with the effects of chromatic dispersion and stimulated Mandelstam-Brillouin scattering (SMBS) are considered. A technique for assessing the introduced instability in cascading FOCL is given. The operation of FOCL with two stages has been experimentally studied. The possibility of simultaneous transmission of signals of the quality of the active hydrogen maser of 100 MHz and 1 PPS by a pair of coupled modems through the FOCL with an optical budget of up to 25 dB at a wavelength of 1310 nm is shown, which, in terms of the nominal length of the FOCL, corresponds to 60 km and with an optical budget of up to 29 dB over the length waves of 1550 nm, which, in terms of the nominal length of the FOCL, corresponds to more than 110 km without the use of optical amplifiers, and when using a two cascaded technology, the achievable nominal length of the FOCL doubles.

Citation

Text

BibTeX

RIS

A. V. Zheglov, R. S. Kobyakov, R. N. Novozhilov, S. Yu. Medvedev. Increasing the Transmission Range of Frequency and Time Signals by VCH-608 Modems // Transactions of IAA RAS. — 2023. — Issue 67. — P. 35–43.

@article{zheglov2023,
  abstract = {The features of transmission of frequency and time signals are considered depending on the length and elemental composition of the FOCL, taking into account the total and return losses.
The studies were carried out on the basis of two modifications of the VCH-608 and VCH-608.02 modems. In modifications of the VCH-608 modem, a circulator is used to organize duplex communication. Modems of this modification are connected via one fiber. To transmit 100 MHz and 1 PPS signals, two wavelengths of 1310 nm and 1550 nm must be used. However, there are no available optical amplifiers that operate simultaneously at these two wavelengths. In modifications of the VCH-608.02 modem, four fibers of a single cable module are used to organize duplex communication. This makes it possible to transmit 100 MHz and 1 PPS signals at the same wavelength, and also simplifies the use of optical amplifiers and chromatic dispersion compensators in fiber optic lines.
Prototyping of options for transmitting frequency and time signals by pairs of conjugated modems and their cascades has been carried out. The limitations on the optical budget of FOCL associated with the effects of chromatic dispersion and stimulated Mandelstam-Brillouin scattering (SMBS) are considered. A technique for assessing the introduced instability in cascading FOCL is given. The operation of FOCL with two stages has been experimentally studied.
The possibility of simultaneous transmission of signals of the quality of the active hydrogen maser of 100 MHz and 1 PPS by a pair of coupled modems through the FOCL with an optical budget of up to 25 dB at a wavelength of 1310 nm is shown, which, in terms of the nominal length of the FOCL, corresponds to 60 km and with an optical budget of up to 29 dB over the length waves of 1550 nm, which, in terms of the nominal length of the FOCL, corresponds to more than 110 km without the use of optical amplifiers, and when using a two cascaded technology, the achievable nominal length of the FOCL doubles.},
  author = {A.~V. Zheglov and R.~S. Kobyakov and R.~N. Novozhilov and S.~Yu. Medvedev},
  doi = {10.32876/ApplAstron.67.35-43},
  issue = {67},
  journal = {Transactions of IAA RAS},
  keyword = {transmission of precision frequency and time, compensation of phase instability, comparison of time scales},
  pages = {35--43},
  title = {Increasing the Transmission Range of Frequency and Time Signals by VCH-608 Modems},
  url = {http://iaaras.ru/en/library/paper/2169/},
  year = {2023}
}

TY  - JOUR
TI  - Increasing the Transmission Range of Frequency and Time Signals by VCH-608 Modems
AU  - Zheglov, A. V.
AU  - Kobyakov, R. S.
AU  - Novozhilov, R. N.
AU  - Medvedev, S. Yu.
PY  - 2023
T2  - Transactions of IAA RAS
IS  - 67
SP  - 35
AB  - The features of transmission of frequency and time signals are
considered depending on the length and elemental composition of the
FOCL, taking into account the total and return losses.  The studies
were carried out on the basis of two modifications of the VCH-608 and
VCH-608.02 modems. In modifications of the VCH-608 modem, a
circulator is used to organize duplex communication. Modems of this
modification are connected via one fiber. To transmit 100 MHz and 1
PPS signals, two wavelengths of 1310 nm and 1550 nm must be used.
However, there are no available optical amplifiers that operate
simultaneously at these two wavelengths. In modifications of the
VCH-608.02 modem, four fibers of a single cable module are used to
organize duplex communication. This makes it possible to transmit 100
MHz and 1 PPS signals at the same wavelength, and also simplifies the
use of optical amplifiers and chromatic dispersion compensators in
fiber optic lines.  Prototyping of options for transmitting frequency
and time signals by pairs of conjugated modems and their cascades has
been carried out. The limitations on the optical budget of FOCL
associated with the effects of chromatic dispersion and stimulated
Mandelstam-Brillouin scattering (SMBS) are considered. A technique
for assessing the introduced instability in cascading FOCL is given.
The operation of FOCL with two stages has been experimentally
studied.  The possibility of simultaneous transmission of signals of
the quality of the active hydrogen maser of 100 MHz and 1 PPS by a
pair of coupled modems through the FOCL with an optical budget of up
to 25 dB at a wavelength of 1310 nm is shown, which, in terms of the
nominal length of the FOCL, corresponds to 60 km and with an optical
budget of up to 29 dB over the length waves of 1550 nm, which, in
terms of the nominal length of the FOCL, corresponds to more than 110
km without the use of optical amplifiers, and when using a two
cascaded technology, the achievable nominal length of the FOCL
doubles.
DO  - 10.32876/ApplAstron.67.35-43
UR  - http://iaaras.ru/en/library/paper/2169/
ER  -